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Recent Developments in the Application of Live Feeds in the Freshwater Ornamental Fish Culture

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Recent Developments in the Application of Live Feeds in the Freshwater Ornamental Fish Culture Available online atwww.sciencedirect.com s c i e n c e ^ d i r e c t . Aquaculture ELSEVIER Aquaculture 227 (2003) 319-331 www. elsevier. com/locate/aqua-online Recent developments in the application of live feeds in the freshwater ornamental fish culture Lian Chuan Lima’*, Philippe Dhertb, Patrick Sorgeloos0 a Freshwater Fisheries Centre, Agri-food and Veterinary Authority o f Singapore, Sembawang Research Station, Lorong Chencharu 769194, Singapore hINVE Technologies NV, Oeverstraat 7, B-9200 Baasrode, Belgium c Laboratory o f Aquaculture and Artemia Reference Centre, University o f Ghent, Rozier 44, B-9000 Ghent, Belgium Accepted 30 May 2003 Abstract The industrial development of freshwater ornamental fish culture has been hampered by the lack of suitable live feeds for feeding the fish at the various production stages. This paper reports the recent developments in the applications of the freshwater rotifers {Brachionus calyciflorus), Artemia nauplii, decapsulatedArtemia cysts and on-grown Artemia in the freshwater ornamental fish culture. Results demonstrate that the rotifers are an ideal starter feed for dwarf gourami {Colisa lalia), a typical freshwater ornamental fish species with larvae that are too small to ingest Artemia nauplii or Moina at its first feeding. Compared with the conventional yolk food, the use of rotifers as a starter feed significantly improves the growth and survival of the gourami larvae (Days 2-12), and the beneficial effects are extended to the subsequent Artemia-feeding phase (Days 13-32). The freshwater rotifers and Artemia nauplii are also useful in raising Discus larvae in the absence of their parents, which would eliminate the risk of larvae being eaten by the parent fish. Work on decapsulatedArtemia cysts indicates that the cysts could be used as a substitute forArtemia nauplii or Moina in freshwater ornamental fish culture. The fry of all the five common ornamental fish species tested (guppyPoecilia reticulata, m olly Poecilia sphenops, platyXiphophorus maculatus, swordtail Xiphophorus helleri and neon tetra Hyphessobrycon herbertaxelrodi) could readily feed on the decapsulated cysts, and their performances in terms of stress resistance, growth and survival are comparable to or better than those fed on Artemia nauplii or Moina. A culture system for production o f on-grow n Artemia has also been developed specifically for the use in freshwater ornamental fish farms. The system, using diluted artificial seawater of 20 %o for culture, has a mean production rate of 3 kg/m3 of water in a 12-day cycle and a production capacity of 8 metric tons of on-grown Artemia a year. With the system, farmers could produce any specific size of on-grownArtemia o f up * Corresponding author. Tel.: +65-7519852; fax: +65-7523242. E-mail address: [email protected] (L.C. Lim). 0044-8486/$ - see front matter © 2003 Elsevier B.V. All rights reserved, doi: 10.1016/S0044-8486(03)00512-X 320 L.C. Lim et al. / Aquaculture 227 (2003) 319-331 to 5 mm to suit the age and size of their fish, by varying the time of harvesting. This characteristic, coupled with the use of bioencapsulation technique to enhance the quality of the on-grown Artem ia, would make the organism an ideal nursery diet for freshwater ornamental fish. All these results show that the live feeds used in marine foodfish hatchery could be applied to freshwater ornamental fish culture to improve their performance. © 2003 Elsevier B.V. All rights reserved. Keywords: Ornamental fish; Live feeds; Rotifer; Decapsulated Artemia cysts; On-grown Artemia 1. Introduction The success in the hatchery production of fish fingerlings for stocking in the grow-out production system is largely dependent on the availability of suitable live food organisms for feeding fish larvae, fry and fingerlings. The availability of large quantities of live food organisms such as marine rotifer ( Brachionus plicatilis and Brachionus rotundiformis) and Artemia nauplii to meet the different stages of fry production has contributed to the successful fry production of at least 60 marine finfish species and 18 species of crustaceans (Dhert, 1996). In contrast, the industrial development of freshwater ornamen­ tal fish culture has been hampered by the lack of suitable live feeds for feeding the fish at the various production stages. Currently, inert food items such as egg yolk suspension, milk powder or powdered feeds and natural plankton bloom induced by artificial fertilisation of water are used in larval feeding, and Moina and Tubifex that are cultured in water enriched with organic manure are fed to bigger fish or brooders. There is also no suitable live feed for feeding early fish larvae with small mouth. These traditional practices not only limit the fish stocking density, but also adversely affect fish quality. Many freshwater ornamental fish farmers have shifted from Moina to the cleaner Artemia nauplii for feeding their young fish. As the nauplii (length of instar-1 Artemia <0.55 mm) are only half the size of Moina (length < 1.20 mm), it is necessary to look for bigger organisms, both to fill in the size gap, and as a substitute of Tubifex for feeding larger fish such as brooders. Furthermore, the high price of Artemia cysts has increased the fish production cost, and cheaper alternative diets with comparable nutritional quality are needed to maintain the cost competitiveness of ornamental fish in the global market. Many of the modem larviculture technologies used in marine foodfish hatcheries could be adapted for application in the freshwater ornamental fish production. Some of the possible applications have been reported in Dhert et al. (1997). This paper reports the recent developments and discusses the applications of the freshwater rotifers Brachionus( calyciflorus). Artemia nauplii, decapsulatedArtemia cysts and on-grown Artemia in the freshwater ornamental fish culture, based on the studies conducted in Singapore. 2. Rotifers The marine rotifers B. plicatilis is the most important live food organism for use in larviculture of marine foodfish. Their small size and slow swimming velocity make them an L.C. Lim et al. / Aquaculture 227 (2003) 319-331 321 ideal live food organism for fish larvae that cannot ingest the larger Artemia nauplii. Marine rotifers can survive in freshwater for at least 2 h, and have been used for feeding larvae of tilapia Oreochromis spiluus (Cruz and James, 1989), gudgeonGobio gobio L. (Kestemont and Awaiss, 1989) and Japanese ornamental carpCyprinus carpio and baitfish Carassius sp. (Lubzens et al., 1987). However, marine rotifers sink quickly to the bottom and are therefore not suitable for feeding freshwater fish species with pelagic larvae, unless they are supplied continuously with a peristaltic pump. In this respect, freshwater rotifer such asB. calyciflorus is likely to have better potential for application in the larviculture of freshwater ornamental fish. To date, the use of freshwater rotifers is restricted to only a few freshwater foodfish species such as sunshine bass Morone chysops x Morone saxatilis (Ludwig, 1994 ) and gudgeon and Eurasian perch Perca fluviatilis (Awaiss, 1991; Awaiss et al., 1992). The use of the freshwater rotifers B. calyciflorus in the larviculture of freshwater ornamental fish was demonstrated in a recent study using dwarf goiuami (Colisa lalia) in Singapore (Lim and Wong, 1997). The B. calyciflorus used in these experiments were produced by batch culture usingChlorella spp. as feed. Dwarf goiuami was selected for the experiment because of its small larvae, which measiue 2.74 mm total length and cannot ingest macrozooplankton such as Moina and Artemia nauplii at first feeding. Traditionally, larvae of dwarf goiuami are raised in fertilised concrete ponds with earthen bottom (Femando and Phang, 1994). Due to the difficulties in controlling water quality and the fluctuation in the quality and quantity of live food organisms, the stocking density is low (0.5 larvae/1) and the larvae are fed with egg yolk particles for the first 10 days. The study conducted in indoor tanks (10- and 200-1 tanks, stocking densities 10 larvae/1 from Day 2 and 30 larvae/1 from Day 13) demonstrated that compared with egg yolk particles, the use of the freshwater rotifers as a starter feed significantly improved the growth and survival of dwarf goiuami larvae during the rotifer-feeding phase (Days 2 — 12). These beneficial effects also extended to the subsequent Artemia nauplii feeding phase (Days 13-32). At the Artemia feeding phase, although all the larvae in the egg yolk group and the rotifer group were similarly fed withArtemia nauplii, the growth and survival of the rotifer group continued to be significantly better than those of the egg yolk group in that stage. Since the quantity of feed in the experiments was not limiting, these findings suggested that the quality of a starter feed was crucial to the later stages of development. Fish that were fed sub-optimally in the early stage would continue to suffer from poor performance later. At metamorphosis on Day 32, the overall survival rates of larvae fed rotifers in indoor tanks were 65.1-74.5%, which were about foiu times those fed egg yolk particles in the outdoor, 100-m3 ponds (17.5%). The mean total lengths at metamorphosis in the indoor tanks (10.5-11.8 mm) were also significantly higher than in 100-m3 ponds (8.55 mm, P< 0.05). Based on the stocking density, overall survival rates and the volume of rearing water, the yields of fry derived from larvae fed rotifers were estimated to be 6500 and 7500 fry/m3 in the indoor tanks, which were much higher than 90 fry/m3 obtained by farmers in 100-m3 ponds, with larvae fed with natural plankton supplemented with egg yolk particles. The use of freshwater rotifers is likely to have an important impact to the freshwater ornamental fish industry.
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